Motion-picture projector



June 14, 1949. o. R. NEMETH MOTIN-PICTURE PROJECTOR 5 Sheets-Sheet 1 Filed Dec. 4, 1944 lhn= .j w ON 1 lm'v Q m Q S HZIeTmNm Q" Q S N\\\ G S O Gwdn mm, MQ LV, S S vw Q O. R. NEMETH MOTION-PICTURE PROJECTOR June 14, 1949.

5 sheets-Sheet 2 Filed Dec. 4, 1944 v i12/mo? 1%@ e M R w o m Wwf .lume 14, 1949.`

o. RNr-:METH 2,472,983

MOTION-PICTURE PROJECTOR Filed Dec. 4, 1944 5 Sheets-Sheet 5 O. R. NEMETH MOTION-PICTURE PROJECTOR 5 Sheets--Sheet` 4 `lune 14, 1949.

FiledDec. 4, 1944 fizzfelznr y ooiiwenge/z O. R. NEMETH June 14, 1949.

MOTION-PICTURE` PROJECTOR 5 Sheets-Sheet 5 Filed Dec. 4, 1944 Patented June 14, 1949 UNITED sTATEs PATENT oFFlcE zcnims. (o1. 242-55) The present invention relates. to improvements in motion picture projectorsand more particu,- larly concerns the film handling means for such projectors.

An important object of the present invention is to provide ina motion picture projector an improved film handling mechanismhaving supply reeland take-up. reel mechanisms operating in an especially-'advantageous integrated relationship for nlm take-up during running of; the projector and for rewinding` of the'fllm after the lm has run out. onto they take-.up reel.

,Another object is to provide a novel positive acting, load-compensated constant torque operating means for the take-upreel.A

A further object of the invention is to provide an improved film` rewinding. mechanism.

Still another object is to provide novel changeover means for converting the film feeding and take-up apparatus oi a motionpicture machine quickly and alternatively for rewinding Yet another ,object of the invention. is-to pro vide improved means for supporting the nlml reels in a motion picture projector., A

Other objects, vfeatures and. advantages of the invention will be readily apparent from the following detailed description of an exemplary embodiment of. the invention taken together with the accompanying five sheets oi drawings illustrating the same and in which: y f y lFigure 1 is a side elevational viewof, the pro-- jection side oi a motion picture. projector embodying the featuresy oi my invention.

Fig. 2 is an elevational view oi the inner or reverse side of the mainmounting panel of the projector.

Fig. 3l is a top-plan View lof the main lpanel and supported mechanisms..

Fig. 4 is anl enlarged fragmental sectional cleftail vvievv taken substantially along thepline Ll-A of Fig. 1.A

.substantially in the plane,y ofxli-nefl-Hl of Fig. 2.

. Fig;- 8 iS a verticalsectional detail viewtalren .substantially inA the plane of line amaai Fig. 5.

Fig. 9 is a Wiringr diagram of the electrical cirby which operation ofthe projector, and' in `particular the iilmE handling mechanism thereof is controlled.,

`Having more. particular reference tothe-.drawlnga .an exemplary motion picture. projector Yin l embodying the features of my invention is shown as oi the portable or home movie type equipped with a main mountingpanel I I which carries all of the apparatus and attachments involved in the physical operation of projecting a motion picture and which is adaptedto be supported in vertical position Within a carrying case l2. The mounting panel II carriesv adjacent to its forward end a projection lens unit I3 rearwardly of which is mounted a film gate I4.. Through the film gate is adapted to be threaded a motion picture lm strip I5 to receive therethrough a concentrated projection light beam from a light source such as a lamp I1 (Fig. 3) carried within a lamp housing I8 (Figs. 2 and 3) .which is located at .the inside of the mounting panel. Light from the lamp I1 is concentrated and transmitted for projection purposes by an optical system (not shown) at least in part. nclosed by a cover I9 mounted at the projection side of the mounting panel (Fig. 1). After passing' through the lm gate lli, the lm. I5 may be conducted through a sound -head 20.

Before projection, the lm strip I5 is contained upon a feed or supplyreel. 2I from which it is drawn in the operation of the projector by a feed sprocket 22 (Fig. l). After leaving the sound `head 20, the film strip I5 is Wound upon a takenip reel 23. smoothly coordinated advance of the -lm strip I5 is accomplished by a unitary drive 24 including a motor 25 which motivates a gear train and a filmesproraket-synchronizing chain 21 (Figs. 2 and 3).

According to the present invention, the mounting and operation of thesupply reel 2| and the take-up reel 23 are correlated in an improved manner for film feeding and rewind purposes and .for ease and simplicity of control, and the construction is such that an unusually compact and eicientarrangement is secured. Toy this end the means for operatively mounting both of the reels is carried by themounting panel II in such a manner that when the reels are dismounted all of the reel mounting means will either lie entirely within or can be quickly and conveniently located Within the confines. of the case I2 without requiring any disassembly to enable closing of the outer :side of the mounting panel II by a removable cover .('not'shownlf vas is desirable to protect the projection apparatus for transportation or storage.

Accordingly, theV supply reel '2| is preferably adapted to beY operatively mounted upon a stud shaft'y spindleZs carriedby a supporting arm 29 (Figs. f1, 2 and .4), adapted to. project upwardly from the top of the mounting panel Il adjacent to the lm feeding sprocket 22 sufdciently to hold the reel peripherally clear of the sprocket. The supply reel arm 29, however, is mounted to be swung down from an operative position as shown in full outline (Fig, 1) to an out of the way or collapsed position within the coniines of the case l2 as shown in broken outline in Fig. 1. For this, the arm 2S is preferably rockably mounted adjacent to its lower end, as best seen in Figs. 1 and 4, upon a tubular stud 32 extending from the upper part of the front face of the mounting panel Il For convenience in assembly and eflciency in operation, the stud 39 is formed as a short cylindrical shaft extending through a bearing opening 3l in the arm 29 and slidably into a ange 32 which extends through an opening 33 in the panel Il and is secured to the panel as by means of screws 34. To retain the arm 29 against axial displacement, the stud 30 is formed with an integral retaining flange at its outer end. After the stud 39 has been assembled with the arm 29 and then with the flange 32, one or more set screws 31 threaded radially through the flange 32 are driven bindingly against the stud 30 within a radial groove 38 which, as shown, is preferably wider than the set screws in order to permit proper axial adjustment in assembly for free swinging of the arm 29 between the face of the panel Il and the retaining flange 35.

Determinative of the fully extended or upwardly projecting position of the supply reel arm 29 is a bracket 39 which may be secured in any preferred manner as by means of screws 130 to the mounting panel H forwardly of the predetermined position to be assumed by the extended arm 29 and preferably in such relationship that the arm 29 will lean forwardly into the bracket. Thereby the weight of the arm 29 plus the weight of the supply reel 2| and the lm carried thereby will tend at all times to hold the arm in the bracket 39 and minimize any tendency of the arm to swing back toward collapsed position during operation.

Further assurance against reverse swinging of the arm 29 during operation is afforded by a spring-urged locking plunger 4i which is carried by an outwardly projecting boss 42 on the arm 29. The plunger projects normally inwardly under the influence of a spring i3 to extend through a socket lll provided therefor in the facc of the mounting panel Il and adapted to register with the detent 4l in the fully extended or operating position of the arm 29. To release the supply reel arm 29 for collapsing, the detent il is retracted by manipulating the head 45 thereon at the outer side of the arm.

Restrained paying out of the film l5 from the supply reel 2i, permitting the nlm to be withdrawn without strain by the supply sprocket 22 but nevertheless preventing overrun of the reel 2|, is effected by rotary mounting of the supply spindle 28 and the application of frictional braking force thereto by means which may also be actuated for rewinding the iilm upon the supply reel. Accordingly, the supply reel 2l is adapted to be keyed upon the spindle 28 as by means of a pivoted keying latch 41; This latch is adapted to be swung open to the full line position in Fig. 4 in order to receive or release the reel, or into the dot-dash position of Fig. 4 (full line position in Fig. 3) to lock the reel against axial displacement and also for joint rotation with the spindle.

A rotary mounting for the .spindle is provided by spaced bearings 48 and 49 of 'which the bearing 4 48 is supported directly by the main body of the supply reel arm 29 and the bearing 49 is supported by a removable cover plate 59. The cover plate 5l) is provided for closing a chamber 5I within the arm 29 and is secured in place by means such as screws 52.

Within the chamber 5I is a flexible belt 53 which may be of the closely coiled spring type. A pulley 54 secured upon the inner end portion of the stud shaft 28 has the flexible belt 53 looped thereover. The belt is also looped over and is maintained under driving tension by a driving pulley 55 carried by a shaft 51 which is rotatably supported within the tubular arm-supporting stud 30. Through this arrangement when the driving pulley 55 is held stationary or substantially so, a corresponding frictional drag is imposed upon the pulley 54 and thus upon the supply reel spindle 28. This condition preferably prevails during the projection of a moving picture in the course of which lm is withdrawn from the supply reel 2l. On the other hand rewinding of the lm strip l5 upon the supply reel 2| can be effected rapidly by actuation of the driving pulley 55 to drive the flexible belt 53 and thereby the spindle pulley l5ft to rotate the spindle 28 and the supply reel 2l for rewinding. Driving power is adapted to be transmitted to the driving pulley shaft 5'! through a sprocket 59 secured fixedly upon the inner end portion of the shaft and having a transmission sprocket chain 69 meshing therewith.

During projection of a motion picture, the drive chain 60 is maintained inactive and under at least a certain degree of braking restraint so as to have a braking eifect upon the supply reel 2i as described. At the same time the take-up reel 23 is positively driven to wind up the lm I5 thereon as it leaves the sound head 20.

As an important feature of the invention, the drive for the take-up reel 23 involves the application of a constant driving torque which re` sults in a constant but non-damaging tension upon the lm being rewound. Furthermore, the rewind tensioning torque is maintained substantially uniform irrespective of the weight of film reeled upon the take-up reel 23 or possibly the halting delivery of lm. For instance, should the film at any time come to a stop for any reason or for any length of time While the take-up is in operation, the take-up tension will not increase appreciably but will be maintained constantly and take-up resumed instantly upon release of the lm strip from the stoppage. To this end, the take-up reel 23 is adapted to be supported by a take-up shaft 6I (Fig. 5) which is rotatably journaled in spaced bearings 62 mounted within a hub 63 on a rocker arm 64 (Figs. 5 and 8). In the present instance the rocker arm extends in a forward direction and is rockably lsecured as by means of a screw G5 to a supporting member El which herein is a casting mounted upon the inner face of the mounting panel H. The hub 63 is of such length as to extend to a limited extent beyond the outer face of the mounting panel Il through a vertical rockingclearance slot 68. In this way the outer end portion of the rocker hub 63 provides a rest for the supply reel arm 29 when the latter is in the co1- lapsed condition indicated in broken outline in Figs. 1 and 5.

- The take-up reel shaft 6l has a latch B9 which interlooks with the take-up reel 23 to effect joint rotation of the reel and shaft. The longitudinal vposition of the take-up reel shaft 6l in the rocker hub 63 is maintained by a collar I9 fast upon the @imm shaft adjacent the outer: end-ot: the huny anda flanged member H secured as'by means., of: ataper pin i2 tothe. inner end?. portion ofv the.V shaft..

In the. attainment or the constant takeeup. tension, a frictional overrunnng. drive; is provided. for the` take-up; reell shaft Gil.. Accordingly, a friction roller '|i3 is` mounted on the flanged member 1|: serv-ing as. itsr hub. Thematerial of the roller '|3` should be selected formoderate fric tional qualities but yet` the abilityl to.y slip-v, relative tot a relativelynon-iriction drivingzmember With.- out undue wear. It should' also be possessed of; a suiicient degree of firmness to retain a preferred profile under a substantial load in operation. Very excellentI results-in practice have been at` tained with rollers made from compressed ground cork bonded to provide a reasonably solid though sufficiently resilient roller mass capable of withstanding all of the stresses and strains to which the roller is subjected in use. Such a, roller can, as best seen in Fig. 5, be mounted upon the hub by clamping the hubportion thereof between the flange of the hub and a retaining flange 14 which may have roller-penetratingl non-rotation gripping indentations 'I5v and is adapted to `be locked' in place by meansY such as a peened flange or upsetting T| on the adjacent end of the hub. Maximum frictional interengagement of the friction roller 13 with a driving roller 18 is aiorded by' a substantially taper-Wedge peripheral contour o-f the friction roller 13 for engagement with a complementary V-groove 19 in the roller 18, The root of the Vf-groove T9- is preferably formed as a relief groove 80 for accommodating the extreme peripheral projection of the friction roller 13 under compressive load within the V-groove and also to accommodate the extreme periphery as the friction roller Wears down after long use.

By preference the driving roller 18 is formed from a material which will present a hard relatively smooth surface within the V-groove 19. Chromium plated brass or steel has been 'found quite satisfactory but a plastic material presenting an. adequately smooth surface is also practicable.

In the preferred arrangement, the driving roller 1B is mounted vertically below the 'friction roller '|3 and at such an elevation that the full weight of the take-up reel 23 and of any variable quantity of film thereon is carried directly by the drive roller through the medium of the friction roller 13. Accordingly, the drive roller 1S is mounted upon a drive shaft 8| to which it may be secured ixedly as by means of a taper pin 82. Bearings 83 and 84 in spaced relation at opposite sides of the drive roller and carried by the supporting bracket casting 61 support the drive shaft 8| rotatably at an elevation predetermined to maintain the driving periphery of the drive roller 18 at a height designed to hold the rocker varm hub 'E3 clear of the bottom of the slot 68 but sufficiently below the top of the slot to enable optional upward rocking of the rocker arm 64 to carry the friction roller T3' clear of the drive roller 18. A spacer S5 adjacent to thebearging rate at which film is delivered' by the feed sprocket 22 andl the coordinated sound vhead vin siriochats;V As:A arresult. they drive relier i8 `slips relative to the interengaging; traction surfaces or thea friction. roller 23. Hence, the frictional characteristics' of: the-,friction roller '|3 Wirl-l-f as@ sure. that the tensioning' torque: or the take-un reel ccntinuesi constant 'andwithout any tendency toward backlash should 'anything cause the t5 to be delivered ierkily tothe take-up reel. Furthermore., as the inertia ot the; take-up. reel increases, due to accumulating load, of dur` in@ operation, the. increased. Weight causes: the. proportionately greater traction oi the friction rcller li upon the drive roller i8., This come pensates for the increased inertia and assures constant; positive talee-up; torque...

A power' drive for the drive roller shaft 8 4, is proyided'herein byA a. motor |31A carried by the. supe portingbracket dl' and having, a through shaft dit upon. one. end oi'which is a. worm 89 meshing with awormgear lllisecured upon the driveshaft Bil-as bymeans of one or more set. screws 9|: secured' within an annular keying groove 02 in the shaft; At its opposite end the motor shaft. -88 carries an exhaust blower type fan 93 (Fig; 2i for creating a. cooling circulation of air through the lampzhousing |i'8`.,

the conclusion of a projection interval,l re;- winding of the; from the, takerup reel 23 to the. supply reel 2| is, according to the present invention, eniected byI disconnecting the take-up friction roller 13 from the dri-ve roller 'i8 and lestablishing av driving connection fzor the rewind vdriving chain 60 witl'rthe drive shaft; 8|. For this purpose the. rewind chain lili isV engaged over Va drive sprocket 94 carried by av clutch element 9.5 which isslidably'carriedby theV drive shaft 8..| between the drive roller-*'18 and the bearing 8-3. A tensioning; roller fili engages the chain 60 at a point between the sprockets 5B and 9d. Ample clearance is afforded to permit axial slid-ing of the clntch element 95E to carry a diametral clutch tooth 91 thereon into. or out of clutching engagementiy within a, complementary diametral clutch slot/9B provided in the opposing face of the drive roller.

Means for normally'v urgingthe clutch element 951 toward clutching interengagement with the ,drive roller '|58 may comprise a ooi-led compression spring 09, bearing at one end against the adjacent end of the; hearing 83 and driving against the clutch element 951 within an appropriate socket |00. Opposing the spring 9:9 to hold the clutch 'element 95? inactive in dcclutched position while 'the apparatus is in take-up operation is means rformed intermediate its end with a right angular o'fsetting flange Ill5` -ti'on |01 which clears the supporting bracket 61 vand carries the -oiset declutching iingers @l2 and |03 as best seen in Figs. V5 and '7 and which are ioine'd tothe head'section by declutching cams This provides a head sectending through 'a longitudinal guidey slot |08a in the' head section |01' is threaded into a boss |08 provided on the bracket 6'1 for defining the pro per roperative plane for the head section 0'| and thereby' theV declutching ng'ers |02 and |03.

Thus, shifting of the declutching member longitudinally to carry the declutching fingers |02 and |03 beyond the opposing clutch flange |04 effects release of the clutch by permitting movement of the clutch flange |04 into the clearance provided by the head section |01 inwardly of the declutching cams |02a and I031, as seen in Fig. 8.

Means for actuating the clutch lever |0| preferably comprises a knob l0 having an operative connection with the lever adjacent to its end remote from the declutching ngers. For this purpose, the knob |I0 is conveniently located for manipulation at the front of the mounting plate and is formed with a pointer adapted to indicate the operative position of the device with relation to appropriate indicia on the front of the mounting panel, such for example as appropriate wording |2. In the present instance, this indicia comprises the word Projection toward which the pointer extends when the lever |0| as is in the declutching position, and the word Rewind, indicative when the pointer is directed thereto of the clutch-releasing condition of the lever.

As seen in Fig. 1, the knob ||0 is preferably located in a position directly behind the path of travel of the nlm I5 from the sound head 20 to the take-up reel 23. As a result, the take-up reach of the film l5 serves as a guard or at least reminder to the operator to forestall accidental or absent minded manipulation of the knob ||0l while there is yet film to be taken up. This is especially advantageous where at the conclusion of a moving picture the trailing leader has not yet left the sound head 20.

An operative connection between the knob H0 and the clutch lever |0I is effected through the medium of a crank I|3 (Figs. 2, 6 and '7) which comprises a crank shaft H4, a crank arm ||5 riveted to one end of the crank shaft and a crank pin The crank shaft ||4 extends outwardly through the mounting panel I through abushing ange I8 and into a bushed shaft hole H9 in the knob I l0 where a detachable connection with the shaft is afforded by means such as a set screw engaging a at |2| on the shaft. Interengagement of the crank pin II'! with the clutch lever |0| is eifected by projection of the crank pin through a crank pin follower slot |22 which in the present instance is disposed perpendicularly to the longitudinal axis of the clutch lever and in such relation to the crank I I3 that when the knob l0 is turned from the Projection position to the Rewind position, the clutch lever |0| will be shifted completely from the declutching to the clutch-releasing position by the action of the crank pin I in the follower slot I 22.

The relationship of the crank pin lll to the follower slot |22 is such, moreover, that when the knob il@ has been turned to the Rewind position the crank arm H5 extends parallel or a little over-center relative to the axis of the clutch lever and positively holds the clutch lever Vagainst. the action of return biasing means such as spring |23 (Fig. 8). As best seen in Figs. 2, 5, l and 8, the return spring |23 may be a coiled tension spring hooked onto a spring anchoring .lug |124 struck out integrally from the body of .the clutch lever lili. The opposite end of the spring 23 is hooked onto a stop pin |25 fixedly supported by the mounting `plate and extending through a, longitudinal slot |21 in the clutch lever. The spring |23 is vmaintained under such tension that it continuously urges the clutch lever ISI toward declutching position and there- '2 -lil Cil

fore acts to snap the clutch lever |0| back into declutching position when the clutch "lever |0| is released from the clutch-releasing position by swinging of the crank pin ||1 from the clutch releasing position.

In addition to its function as a clutch operator, the lever |0I acts as the medium for effecting separation of the friction roller 13 and the drive roller 'I8 as an incident to conditioning of the apparatus for rewinding. Accordingly, the clutch lever |0| is disposed at such an angle preferably diagonally upwardly that a cam edge |28 at the top of the declutching iinger |02 clears the adjacent underface of the rocker arm hub 63 when the clutch lever is retracted to the declutching position but enters into lifting engagement with the rocker arm hub to lift it slightly but sufficiently to clear the friction roller 'i3 from the drive roller 'i8 when the clutch lever is in clutch-releasing position. As a result, the same turning manipulation of the knob H0 which releases the clutch for rewinding also disconnects the take-up drive from the reel 23 and forthwith converts it into a rewind drive acting through the clutch element 95, the sprocket 94, the rewind chain 60, the driven rewind sprocket 59 (Fig. 4) the drive pulley 55, the exible drive belt 53 and the driven pulley 54 to drive the supply reel shaft 28 and thereby the supply reel 2| at a relatively rapid rate for rewinding the iilin l5 thereon. During the rewinding, the take-up reel 23 rotates freely with the take-up reel shaft 6| in response to pull of the rewinding lrn I5 which has in the meantime been reconnected with the supply reel 2| as indicated in broken outline in Fig. 1.

Upon completion of the rewinding and return of the knob I0 to the Projection position to cause resumption of the declutching position by the clutch lever |0|, the declutching nngers |32 and |03 acting frictionally on the clutch ange |04 and the compressed clutch spring 99 acting frictionally in opposition operate upon the sprocket-carrying clutch element 95 as a brake. This holds the rewind driving chain and thereby the driving pulley virtually stationary to afford a drag upon movement of the exible driving belt 53 and thus upon the pulley '56 and the supply reel shaft 28. The supply reel 2| is thus restrained against overrunning during feeding of the film.

Operation of the projection lamp Il, the film driving motor 25, and the exhaust and take-up drive 'motor 81 is preferably correlated through an electrical circuit controlled by a master switch |30 (Fig. 9) which may be a three position switch as shown. That is, the switch |30 has an "o position in which the projection lamp and motor are non-operative, a starting position which is therein provided for the benefit of the motors, and a running position assumed when the motors are up to speed and coincident with which the projection lamp is switched on. After the lm I| has run out and is entirely taken up by the reel 23 the switch |33 is turned .off and the projector comes to a standstill.

Inasmuch as it is unnecessary, if not actually undesirable, to have the entire projector running while the film is being rewound upon the supply reel 2|, means is provided for operating only the exhaust and take-up drive motor 8l' Ifor actuation of the nlm take-up and rewind drive. To this end, a supplementary circuit including a line |3| is connected with the master Aswitch |30 and the lexhaust and take-up drive motor 81 and is equipped with a normally open switch |32 having an operating lever |33 which isl adapted' to be swung into the closed switch position during the rewind period. An efiicient inode of operating the switch lever |33 comprises, as shown in Figs. 2 and 5, having the switch unit |32 mounted upon the rear of the mounting plate with the switch arm |33 disposed in the path of the shoulder of the clutch lever offsetting flange |05. Thus, when the clutch lever is shifted, as shown in dotted lines in Fig. 2, into the clutch-releasing position incident to initiation of a rewinding operation, the switch arm |33 will be moved into the closed switch position and complete the auxiliary circuit |3| to energize the exhaust and take-up drive motor 81. vThe relationship of the switch arm |33 to the lever shoulder is such that the lever will have 'moved throughout practically its full clutch-releasing and friction roller lifting stroke before the switch arm is actuated to close the switch. This assures that the apparatus is fully set for operation by the time the motor 81 is energized,

As soon as the rewinding operation has been completed, the knob ||'0 is turned back to the Projection position whereupon the clutch lever |0| shifts to the declutching position wherein the switch |32 automatically opens and the friction roller 13 drops into active interengagement with the grooved driving roller 18, and the projector is again in condition to resume operation when the master switch |30 is actuated to energize the motors 25 and 81 and the projection lamp |1.

While I have illustrated and described in detail a preferred embodiment of my invention, I contemplate that various modifications, substitutions and alternative constructions may be effected without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1. In combination in a motion picture projector, a vertical mounting panel, a supply reel shaft, a horizontal take-up reel shaft mounted for vertical movement, a drive shaft, means on said take-up reel shaft and said drive shaft cooperating to provide a separable driving connection effective through gravitational inclination of the take-up reel shaft toward the drive shaft, a drive motor in gear with said drive shaft, and electrical motor circuit including a master switch and a normally open auxiliary switch having an operating arm, means for effecting a rewind driving connection for said supply reel shaft with said drive shaft including means fixed upon the drive shaft and a clutch member axially slidable on said drive shaft and normally biased toward clutching interengagement with said fixed means, and a manually operable elongated rectilinearly reciprocable member including means for holding said clutch member inactive during film take-up operation .but releasable from the clutch member upon rectilinear movement in one direction to effectuate the rewind driving connection for said supply reel shaft, said reciprocable member having means operable simultaneously with clutch release for engaging and lifting said take-up reel shaft away from said drive shaft and separating the driving connection therewith and means acting at the same time to motivate said operating arm for closing said auxiliary switch.

2. In combination in a motion picture pro jector, a vertical mounting panel, a supply reel shaft, a horizontal take-up reel shaft mounted for vertical movement, a drive shaft, means on said take-up reel shaft and said drive shaft cooperating to provide a separable driving connection effective through gravitational inclination of the take-up reelv shaft toward the drive shaft, a drive motor for said drive shaft, an electrical motor circuit including a master switch and a normally open auxiliary switch having an operating arm, means for effecting a rewind driving connection for said supply reel shaft with said drive shaft including means xed upon the drive shaft and a clutch member axially slidable on said drive shaft and normally biased toward clutching interengagement with said fixed means, and a member including means for holding said clutch member inactive during film take-up Operation but releasable from the clutch member upon movement in one direction to effectuate the rewind driving connection for said supply reel shaft, said member having means operable simultaneously with clutch release for moving said take-up reel shaft away from said drive shaft and separating the driving connection therewith and means acting at the same time to motivate said operating arm for closing said auxiliary switch.

OTTO R. NEMETH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,001,448 Riley Aug. 22, 1911 1,277,559 Emory Sept. 2, 1918 1,299,566 Emory Apr. 8, 1919 1,468,499 Frangos Sept. 18, 1923 1,827,893 Kindelmann et al. Oct. 20, 1931 1,846,004 Green Feb. 16, 1932 1,944,029 Foster Jan. 16, 1934 1,979,800 Howell Nov. 6, 1934 2,064,088 Stechbart Dec. 15, 1936 2,067,893 De Vry Jan. 19, 1937 2,099,299 Fritts Nov. 16, 1937 2,207,075 Sperry July 9, 1940 2,212,617 Otto Aug. 27, 1940 2,351,005 Camras 1 June 13, 1944 2,358,692 De Vry Sept. 19, 1944 FOREIGN PATENTS Number Country Date 329,804 Germany Nov. 29, 1920 

